John, Thanks so much.
JRC On Sun, Apr 3, 2011 at 9:18 AM, John Thornton <[email protected]> wrote: > John, > > I think it is finally done... sorry for the delay. > > http://gnipsel.com/shop/rpc/rpc.xhtml > > John > > John Crane wrote: > > John, > > > > Thanks for the update. > > > > JRC > > > > On Sun, Mar 27, 2011 at 6:02 AM, John Thornton<[email protected]> wrote: > > > > > >> I can't find my drawings atm, so I'm recreating them from scratch and > >> will post them as soon as done. Just wanted to let you know I did not > >> forget although sometimes I do. > >> > >> John > >> > >> John Crane wrote: > >> > >>> Thanks, > >>> > >>> John R. Crane > >>> > >>> On Mon, Mar 21, 2011 at 7:27 AM, John Thornton<[email protected]> > wrote: > >>> > >>> > >>> > >>>> John, > >>>> > >>>> I'll dig out my schematic and make sure it is up to date and figure a > >>>> way to post it to the list. > >>>> > >>>> John > >>>> > >>>> John Crane wrote: > >>>> > >>>> > >>>>> John, > >>>>> > >>>>> I would like to know more about the way you have engineered your > phase > >>>>> converters. I am in the process of adding this capability in my > shop. > >>>>> > >>>>> Thanks, > >>>>> > >>>>> John R. Crane > >>>>> > >>>>> On Thu, Mar 17, 2011 at 5:53 AM, John Thornton<[email protected]> > >>>>> > >> wrote: > >> > >>>>> > >>>>> > >>>>> > >>>>>> I have three rotary phase converters. The are all using a potential > >>>>>> relay for the start caps and a relay that pulls in the mains. So I > >>>>>> > >> don't > >> > >>>>>> have to hold the push button and if the power drops out for a few > >>>>>> seconds the phase converter does not try and restart without the > start > >>>>>> caps. I've not had the fun of blowing anything up when building > them. > >>>>>> They are all balanced phase to phase within a couple of volts. > However > >>>>>> phase to phase the run caps are very different in order to get the > >>>>>> voltage phase to phase to balance. I can post some details if anyone > >>>>>> > >> is > >> > >>>>>> interested... > >>>>>> > >>>>>> John > >>>>>> > >>>>>> Dave wrote: > >>>>>> > >>>>>> > >>>>>> > >>>>>>> Back when I put my 10 hp phase converter together, I found some > >>>>>>> > >> charts > >> > >>>>>>> on the web someplace about suggested capacitor sizing. I found a > >>>>>>> > >>>>>>> > >>>> cheap > >>>> > >>>> > >>>>>>> supply of capacitors at Mendelson's in Dayton, Ohio > >>>>>>> and bought a small box of them. I ended up using I believe, 4 - > 330 > >>>>>>> > >>>>>>> > >>>> uf > >>>> > >>>> > >>>>>>> 330 volt units as starting caps and 4- 135 uf run caps. I use a > >>>>>>> > >> push > >> > >>>>>>> button to start the motor and as long as I hold the button > >>>>>>> down the starting caps are wired into the circuit. When the motor > >>>>>>> > >>>>>>> > >>>> spins > >>>> > >>>> > >>>>>>> up I release the button. I tried to use a voltage sensitive > relay, > >>>>>>> like the ones used on refrigeration systems and AC systems, but > >>>>>>> it was not reliable probably due to the high current from the large > >>>>>>> number of caps. There is also a motor contactor that seals itself > in > >>>>>>> via the button push. That way if the line power drops, the > >>>>>>> > >> contactor > >> > >>>>>>> drops out and the converter idler motor and he > >>>>>>> attached slave motors are powered down. > >>>>>>> > >>>>>>> The math relating to how this works gets even more complicated when > >>>>>>> > >> you > >> > >>>>>>> consider the effects of hooking a 3 phase motor that you are going > to > >>>>>>> start (a slave motor) across the the idling phase converter motor. > >>>>>>> For a brief period of time, the idler motor becomes a generator. > >>>>>>> > >> The > >> > >>>>>>> rotor slows slightly and the energy in the rotor pumps power into > the > >>>>>>> three phases and spins up > >>>>>>> the slaved motor. It works very well. > >>>>>>> > >>>>>>> During experimentation, it is very obvious when more starting > >>>>>>> > >>>>>>> > >>>> capacitors > >>>> > >>>> > >>>>>>> are required as the motor will simply not spin up. > >>>>>>> Adding more run caps helps balance the phases but they never really > >>>>>>> fully balance. > >>>>>>> > >>>>>>> Safety glasses are very good idea when experimenting. Starting > >>>>>>> > >> caps > >> > >>>>>>> go off like firecrackers if you overstress them. They are only > >>>>>>> designed to be switched in for a few seconds. > >>>>>>> > >>>>>>> A source of cheap starting caps is a really good idea if you want > to > >>>>>>> > >> do > >> > >>>>>>> some phase converter experimentation. I blew up several of them. > >>>>>>> > >>>>>>> Dave > >>>>>>> > >>>>>>> On 3/14/2011 9:01 PM, Jon Elson wrote: > >>>>>>> > >>>>>>> > >>>>>>> > >>>>>>> > >>>>>>>> > >>>>>>>> > >>>>>>>>> On 14 March 2011 10:50, John Thornton<[email protected]> > >>>>>>>>> > >> wrote: > >> > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> > >>>>>>>>>> Is it not amazing that the hillbillies from backwoods Missouri > >>>>>>>>>> > >> with > >> > >>>>>>>>>> > >>>> a > >>>> > >>>> > >>>>>>>>>> 3rd grade education can make a rotary phase converter without > all > >>>>>>>>>> > >>>>>>>>>> > >>>> the > >>>> > >>>> > >>>>>>>>>> math... > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>> > >>>>>>>>> > >>>>>>>> Of course! The trick is the windings in the motor do all the math > >>>>>>>> > >> for > >> > >>>>>>>> you, all you need to do is hook up the wires. > >>>>>>>> > >>>>>>>> Jon > >>>>>>>> > >>>>>>>> > >>>>>>>> > >>>>>>>> > >>>>>>>> > >>>>>> > >>>> > >> > ------------------------------------------------------------------------------ > >> > >>>> > >>>>>> > >>>>>>>> Colocation vs. Managed Hosting > >>>>>>>> A question and answer guide to determining the best fit > >>>>>>>> for your organization - today and in the future. > >>>>>>>> http://p.sf.net/sfu/internap-sfd2d > >>>>>>>> _______________________________________________ > >>>>>>>> Emc-users mailing list > >>>>>>>> [email protected] > >>>>>>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>>>>>>> > >>>>>>>> > >>>>>>>> > >>>>>>>> > >>>>>>>> > >>>>>>>> > >>>>>>> > >>>>>>> > >>>>>> > >>>> > >> > ------------------------------------------------------------------------------ > >> > >>>> > >>>>>> > >>>>>>> Colocation vs. Managed Hosting > >>>>>>> A question and answer guide to determining the best fit > >>>>>>> for your organization - today and in the future. > >>>>>>> http://p.sf.net/sfu/internap-sfd2d > >>>>>>> _______________________________________________ > >>>>>>> Emc-users mailing list > >>>>>>> [email protected] > >>>>>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>>>>>> > >>>>>>> > >>>>>>> > >>>>>>> > >>>>>> > >>>>>> > >>>> > >> > ------------------------------------------------------------------------------ > >> > >>>> > >>>>>> Colocation vs. Managed Hosting > >>>>>> A question and answer guide to determining the best fit > >>>>>> for your organization - today and in the future. > >>>>>> http://p.sf.net/sfu/internap-sfd2d > >>>>>> _______________________________________________ > >>>>>> Emc-users mailing list > >>>>>> [email protected] > >>>>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>>>>> > >>>>>> > >>>>>> > >>>>>> > >>>>> > >>>> > >> > ------------------------------------------------------------------------------ > >> > >>>> > >>>>> Colocation vs. Managed Hosting > >>>>> A question and answer guide to determining the best fit > >>>>> for your organization - today and in the future. > >>>>> http://p.sf.net/sfu/internap-sfd2d > >>>>> _______________________________________________ > >>>>> Emc-users mailing list > >>>>> [email protected] > >>>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>>>> > >>>>> > >>>>> > >>>> > >>>> > >> > ------------------------------------------------------------------------------ > >> > >>>> Colocation vs. Managed Hosting > >>>> A question and answer guide to determining the best fit > >>>> for your organization - today and in the future. > >>>> http://p.sf.net/sfu/internap-sfd2d > >>>> _______________________________________________ > >>>> Emc-users mailing list > >>>> [email protected] > >>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>>> > >>>> > >>>> > >>> > >> > ------------------------------------------------------------------------------ > >> > >>> Enable your software for Intel(R) Active Management Technology to meet > >>> > >> the > >> > >>> growing manageability and security demands of your customers. > Businesses > >>> are taking advantage of Intel(R) vPro (TM) technology - will your > >>> > >> software > >> > >>> be a part of the solution? Download the Intel(R) Manageability Checker > >>> today! http://p.sf.net/sfu/intel-dev2devmar > >>> _______________________________________________ > >>> Emc-users mailing list > >>> [email protected] > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>> > >>> > >> > >> > ------------------------------------------------------------------------------ > >> Enable your software for Intel(R) Active Management Technology to meet > the > >> growing manageability and security demands of your customers. Businesses > >> are taking advantage of Intel(R) vPro (TM) technology - will your > software > >> be a part of the solution? 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